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Old 2021-11-15, 05:52   #45
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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Quote:
Originally Posted by Batalov View Post
And, to warm up, -- a small update to CPAP-7 (leading to possible CPAP-8 and/or CPAP-9):

2022541154997*619#+x253+210*n, n=0..6 (271 digits)

Don't ask about intermediates. They are all sieved out. But you can check: replace 210* by 2* ...
I have 5 more of these, which I will not report.
I only need ~20 to hit CPAP-8.

The pyramid constant for this form with a certain level of sieving is 20.
Pyramid goes like this: you test candidates, 1/20 of them yields hits of 1st order, 1/202 of them yields hits of 2nd order, etc... (each level is ~1/20)
Currently:
Code:
   53367736  ..6937
    2664600  ..7147
     132644  ..7357
       6621  ..7567
        309  ..7777
         24  ..7987 --> 1/20 of these can have a hit at ..6727 (i.e. CPAP-7)
          1  ..8197 --> CPAP-7, 1/20 of these can have a hit at ..6727 (i.e. CPAP-8)
          0  ..8417 --> CPAP-8, 1/20 of these can have a hit at ..6727 (i.e. CPAP-9)
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